package com.itheima.herbGarden.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.herbGarden.common.CustomException;
import com.itheima.herbGarden.dto.SetmealDto;
import com.itheima.herbGarden.entity.Setmeal;
import com.itheima.herbGarden.entity.SetmealDish;
import com.itheima.herbGarden.mapper.SetmealMapper;
import com.itheima.herbGarden.service.SetmealDishService;
import com.itheima.herbGarden.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper,Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐，同时保存套餐和菜品的关联关系
     * @param setmealDto
     */
    @Transactional
    public void saveWithDish(SetmealDto setmealDto){
        //  insert setmeal
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item) ->{
            item.setSetmealId(setmealDto.getId());     //获取套餐id
            return item;
        }).collect(Collectors.toList());

        //  insert setmealDish
        setmealDishService.saveBatch(setmealDishes);


    }

    /**
     * 删除套餐，同时删除套餐和菜品的关联
     * @param ids
     */
    public void removeWithDish(List<Long> ids){
        //  selsct count(*) from setmeal where id in (1,2,3) and status = 1

        //查询套餐状态，确定是否可以删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId,ids);            // in关键字
        queryWrapper.eq(Setmeal::getStatus,1);

        int count = this.count(queryWrapper);
        if(count > 0){
            //如果不能删除，抛出一个业务异常
            throw new CustomException("套餐正在销售中,不能删除");
        }

        //先删除套餐表中的数据
        this.removeByIds(ids);


        //delete from setmeal_dish where setmeal_id in (1,2,3)      集合（1，2，3）
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);

        //删除关系表setmeal_dish的数据
        setmealDishService.remove(lambdaQueryWrapper);

    }
}
